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Spectral density of complex vector using Welch

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Shz713

Shz713

Structural
Joined
Aug 21, 2015
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221
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AU
Hi all,

For two signals (one with double values and other with complex values), I obtained corresponding auto and cross spectral densities. When I plot the output (attached figure), cross spectral density is shown in negative region. I know I can take absolute of output, but I would like to know why the frequency peaks are upside down. Is this due to complex numbers?

Cheers,

Shoot for the Moon, even if U miss, U still land among Stars!
 
 http://files.engineering.com/getfile.aspx?folder=abe2c2b0-a063-4ab7-8654-090d9dd73ea7&file=Spectral_density.bmp
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